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CVE-2021-47503

6.2 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: scsi: pm80xx: Do not call scsi_remove_host() in pm8001_alloc() Calling scsi_remove_host() before scsi_add_host() results in a c…

Published May 24, 2024CWE-476EPSS 0.25%

Overview

CVE-2021-47503 is a medium-severity vulnerability. It was published on May 24, 2024 and has a CVSS 3.1 base score of 6.2 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 6.2, rated MEDIUM. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

Technical description

In the Linux kernel, the following vulnerability has been resolved:

scsi: pm80xx: Do not call scsi_remove_host() in pm8001_alloc()

Calling scsi_remove_host() before scsi_add_host() results in a crash:

BUG: kernel NULL pointer dereference, address: 0000000000000108

RIP: 0010:device_del+0x63/0x440

Call Trace:

device_unregister+0x17/0x60

scsi_remove_host+0xee/0x2a0

pm8001_pci_probe+0x6ef/0x1b90 [pm80xx]

local_pci_probe+0x3f/0x90

We cannot call scsi_remove_host() in pm8001_alloc() because scsi_add_host()

has not been called yet at that point in time.

Function call tree:

pm8001_pci_probe()

|

`- pm8001_pci_alloc()

| |

| `- pm8001_alloc()

| |

| `- scsi_remove_host()

|

`- scsi_add_host()

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/1e434d2687e8bc0b3cdc9dd093c0e9047c0b4addRefgit.kernel.org/stable/c/653926205741add87a6cf452e21950eebc6ac10bRefgit.kernel.org/stable/c/f8dccc1bdea7e21b5ec06c957aef8831c772661cRefgit.kernel.org/stable/c/1e434d2687e8bc0b3cdc9dd093c0e9047c0b4addRefgit.kernel.org/stable/c/653926205741add87a6cf452e21950eebc6ac10bRefgit.kernel.org/stable/c/f8dccc1bdea7e21b5ec06c957aef8831c772661c

How CyberStrike helps

Frequently asked questions

What is CVE-2021-47503?

CVE-2021-47503 is a medium-severity vulnerability. It was published on May 24, 2024 and has a CVSS 3.1 base score of 6.2 (MEDIUM).

How severe is CVE-2021-47503?

This vulnerability has a CVSS 3.1 base score of 6.2, rated MEDIUM. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2021-47503?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2021-47503?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-47503 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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